Mercedes are afraid of resurgent rivals Ferrari after both teams have claimed two wins in the first four races of the season, according to Ferrari president Sergio Marchionne. (La Repubblica, via F1i.com)

Haas are set to stick with Brembo brakes during this weekend's Spanish Grand Prix, having found they were not getting enough cooling in a recent trial of Carbon Industrie brakes. (Motorsportweek)

Mercedes driver Valtteri Bottas won his first grand prix with victory in Russia but ex-world champion Jacques Villeneuve says "I don't know if he's psychologically ready to fight for the championship". (Planet F1)

Mercedes boss Toto Wolff is "not a fan of shaking up the regulations every two or three years" and believes the Formula 1 field would be closer if they were kept the same. (Crash.net)

Ferrari driver Sebastian Vettel does not believe team-mate Kimi Raikkonen has had the results his performances deserve so far this season. (Eurosport)

Three-time world champion Lewis Hamilton says former team McLaren has a "place in his heart" and it is "sad" to see them struggling at the back end of the grid. (Crash.net)

McLaren driver Fernando Alonso's appearance at the Indy 500 is helping to show the team, driver and engine supplier Honda "are all committed to each other", according to McLaren executive director Zak Brown. (ESPN)

Felipe Nasr is concerned about the lack of Brazilian drivers in Formula 1 and does not want the "legacy" created by the likes of former world champions Emerson Fittipaldi, Nelson Piquet and Ayrton Senna to be lost. (Eurosport)

Mercedes non-executive chairman Niki Lauda says Ferrari are still the stronger team in the race for the world championship, despite Valtteri Bottas' win at the Russian Grand Prix.

Renault have delayed plans to introduce an upgraded engine because of concerns any changes might affect their car's reliability. (Autosport)

Fernando Alonso said testing for the Indy 500 felt "a little bit strange at first", adding: "There's still a long way to go, but I'm happy with the step." (Crash.net)

Mario Andretti, who won the Indy 500 three times and was Formula 1 world champion in 1978, said Alonso has "the same spark" that defined his own illustrious racing career. (Daily Mail)